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#include <QtGui>

#include "highlighter.h"

//! [0]
Highlighter::Highlighter(QTextDocument *parent)
    : QSyntaxHighlighter(parent)
{
    HighlightingRule rule;

    keywordFormat.setForeground(Qt::darkBlue);
    keywordFormat.setFontWeight(QFont::Bold);
    QStringList keywordPatterns;
    keywordPatterns << "\\bclass\\b" << "\\bconst\\b"
                    << "\\benum\\b" << "\\bexplicit\\b"
                    << "\\bfriend\\b" << "\\binline\\b"
                    << "\\bnamespace\\b" << "\\boperator\\b"
                    << "\\bprivate\\b" << "\\bprotected\\b" << "\\bpublic\\b"
                    << "\\bsignals\\b" << "\\bsigned\\b" << "\\bunsigned\\b"
                    << "\\bslots\\b" << "\\bstatic\\b" << "\\bstruct\\b"
                    << "\\btemplate\\b" << "\\btypename\\b"
                    << "\\bunion\\b" << "\\bvirtual\\b"
                    << "\\bvoid\\b" << "\\bvolatile\\b"
                    << "\\b__global\\b" << "\\bglobal\\b" << "\\b__local\\b" << "\\blocal\\b"
                    << "\\b__constant\\b" << "\\bconstant\\b" << "\\b__private\\b" << "\\bprivate\\b"
                    << "\\b__global\\b" << "\\bglobal\\b" << "\\b__kernel\\b" << "\\bkernel"
                    << "\\b__write_only\\b" << "\\bwrite_only\\b"
                    << "\\b__read_only\\b" << "\\bread_only\\b"
                    << "\\b__write_only\\b" << "\\bwrite_only\\b"
                    << "\\b__read_write\\b" << "\\bread_write\\b"
                    << "\\bsampler_t\\b" << "\\bimage2d_t\\b" << "\\bimage3d_t\\b" << "\\bevent_t\\b";

    for(int i = 0; i <= 4; ++i)
    {
        QString str = (i==0? "":QString::number(i));
        keywordPatterns
                << QString("\\bchar%1\\b").arg(str)
                << QString("\\buchar%1\\b").arg(str)
                << QString("\\bcl_char%1\\b").arg(str)
                << QString("\\bcl_uchar%1\\b").arg(str)
                << QString("\\bshort%1\\b").arg(str)
                << QString("\\bushort%1\\b").arg(str)
                << QString("\\bcl_short%1\\b").arg(str)
                << QString("\\bcl_ushort%1\\b").arg(str)
                << QString("\\bint%1\\b").arg(str)
                << QString("\\buint%1\\b").arg(str)
                << QString("\\bcl_int%1\\b").arg(str)
                << QString("\\bcl_uint%1\\b").arg(str)
                << QString("\\blong%1\\b").arg(str)
                << QString("\\bulong%1\\b").arg(str)
                << QString("\\bcl_long%1\\b").arg(str)
                << QString("\\bcl_ulong%1\\b").arg(str)
                << QString("\\bfloat%1\\b").arg(str)
                << QString("\\bcl_float%1\\b").arg(str)
                << QString("\\bdouble%1\\b").arg(str)
                << QString("\\bcl_double%1\\b").arg(str);
    }



    foreach (const QString &pattern, keywordPatterns) {
        rule.pattern = QRegExp(pattern);
        rule.format = keywordFormat;
        highlightingRules.append(rule);
//! [0] //! [1]
    }
//! [1]

//! [2]
    classFormat.setFontWeight(QFont::Bold);
    classFormat.setForeground(Qt::darkMagenta);
    rule.pattern = QRegExp("\\bQ[A-Za-z]+\\b");
    rule.format = classFormat;
    highlightingRules.append(rule);
//! [2]

//! [3]
    singleLineCommentFormat.setForeground(Qt::darkGreen);
    singleLineCommentFormat.setFontItalic(true);
    rule.pattern = QRegExp("//[^\n]*");
    rule.format = singleLineCommentFormat;
    highlightingRules.append(rule);

    multiLineCommentFormat.setFontItalic(true);
    multiLineCommentFormat.setForeground(Qt::darkGreen);
//! [3]

//! [4]
    quotationFormat.setForeground(Qt::darkGreen);
    rule.pattern = QRegExp("\".*\"");
    rule.format = quotationFormat;
    highlightingRules.append(rule);
//! [4]

//! [5]
    functionFormat.setFontWeight(QFont::DemiBold);
    functionFormat.setForeground(Qt::blue);
    rule.pattern = QRegExp("\\b[A-Za-z0-9_]+(?=\\()");
    rule.format = functionFormat;
    highlightingRules.append(rule);
//! [5]

//! [6]
    commentStartExpression = QRegExp("/\\*");
    commentEndExpression = QRegExp("\\*/");
}
//! [6]

//! [7]
void Highlighter::highlightBlock(const QString &text)
{
    foreach (const HighlightingRule &rule, highlightingRules) {
        QRegExp expression(rule.pattern);
        int index = expression.indexIn(text);
        while (index >= 0) {
            int length = expression.matchedLength();
            setFormat(index, length, rule.format);
            index = expression.indexIn(text, index + length);
        }
    }
//! [7] //! [8]
    setCurrentBlockState(0);
//! [8]

//! [9]
    int startIndex = 0;
    if (previousBlockState() != 1)
        startIndex = commentStartExpression.indexIn(text);

//! [9] //! [10]
    while (startIndex >= 0) {
//! [10] //! [11]
        int endIndex = commentEndExpression.indexIn(text, startIndex);
        int commentLength;
        if (endIndex == -1) {
            setCurrentBlockState(1);
            commentLength = text.length() - startIndex;
        } else {
            commentLength = endIndex - startIndex
                            + commentEndExpression.matchedLength();
        }
        setFormat(startIndex, commentLength, multiLineCommentFormat);
        startIndex = commentStartExpression.indexIn(text, startIndex + commentLength);
    }
}
//! [11]
